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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b874c6f0ab18363d43a15f2d17c041aa5924fcc8c57ff5c2a58f683710b13117' 
  AND token = '5kPyuhQKrkPoIAo7LSb6Xclcwa+Y8UZ8L4Xq1wQ1PO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}